Educational discount, if you can manage it, would be the best bet. They all offer them, but exactly how you qualify varies. But you can save thousands of dollars. When you export out of poser you get just the figure and textures. You will have to bone up the figure. Exactly how hard that is is a question I don't have a good answer to, but I'm sure it varies between programs. And whether that really matters depends on just how many figures you need. You are going to rendering 9000 frames for a 5 minute movie, so total difference in project time whether it takes 5 minutes or an hour to set up each figure is going to be noise if you are only using 5 or 10 models. You are probably going to have to be reworking the models (hopefully mostly with subdivision surfaces) for closeups anyway, as the poser figures really doesn't have enough polys for tight work.